NDLI: Analysis on mechanisms and performance of on-line angle correction in LED die sorting

Content Provider	IEEE Xplore Digital Library
Author	Tao Wu Bin Li LongWen Wang Yu Huang
Copyright Year	2010
Description	Author affiliation: National Numerical Control System Engineering Research Center of Huazhong University of Science and Technology, Wuhan, 430074, China (Tao Wu; Bin Li; LongWen Wang; Yu Huang)
Abstract	all dies are required to keep consistent angles in LED chip sorting. It is a problem because all chips are adhesive to wafer tape, each is rotated, and locations of all other dies change. Usually, visual rectification is used for this. While, each correction needs several adjustments, it may decrease production efficiency greatly. To solve this problem, an on-line angle correction method is put forward. Techniques including fast fitting to rotating center with machine vision, reverse seeking angle offset and translation distance for correction, approach for over-quadrant are discussed in detail. In addition, SPN model of sorting is built to analyze its influence to production rate. With experimental results, it is proved to be effective for angle correction with little loss of sort efficiency even in not too good working conditions.
Starting Page	282
Ending Page	287
File Size	295428
Page Count	6
File Format	PDF
ISBN	9781424451401
ISSN	2152744X
DOI	10.1109/ICMA.2010.5589063
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-08-04
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Recycling Markov processes Sorting Clocks Fitting Machine vision Production SPN on-line angle correction machine vision fitting to center of rotation over-quadrant
Content Type	Text
Resource Type	Article

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